Question

rút gọn ạaa

Answer 1

10) \(\dfrac{\sqrt{160}-\sqrt{80}}{\sqrt{8}-\sqrt{2}}-\dfrac{\sqrt{40}-\sqrt{15}}{2\sqrt{2}-\sqrt{3}}\)

\(=\dfrac{4\sqrt{10}-4\sqrt{5}}{2\sqrt{2}-\sqrt{2}}-\dfrac{\sqrt{5}\left(\sqrt{8}-\sqrt{3}\right)}{\sqrt{8}-\sqrt{3}}\)

\(=\dfrac{4\sqrt{5}\left(\sqrt{2}-1\right)}{\sqrt{2}}-\sqrt{5}=\dfrac{\sqrt{80}\left(\sqrt{2}-1\right)}{\sqrt{2}}-\sqrt{5}\)

\(=\sqrt{40}\left(\sqrt{2}-1\right)-\sqrt{5}\)

\(=4\sqrt{5}-2\sqrt{10}-\sqrt{5}=3\sqrt{5}-2\sqrt{10}\)

Answer 2

\(=\dfrac{\sqrt{80}\left(\sqrt{2}-1\right)}{\sqrt{2}}-\sqrt{5}\)

=căn 40(căn 2-1)-căn 5

=4*căn 5-2*căn 10-căn 5

=3*căn 5-2*căn 10